Pressure regulator



lPatented Sept. 15,1925.

UNITED STATES- MYnoN r. LAUGHLIN, or PHILADELPHIA, PENNSYLVANIA',Assrenon To AMERICAN ENGINEERING COMPANY, OF PILADEDPHIA, PENNSYLVANIA,A CORPO? TIO" OF PENNSYLVANIA.

PRESSURE REGULATOR.

Application led October 1.4, 1920. Serial N'o. 416,841.

To all whom t may concern:

Be it known that I, MYRON P. LAUGHLIN, a citizen of the United States,'residing in Philadelphia, Pennsylvania, have invented PressureRegulators (Case A), of which the following is a specification.

One object of this invention is to provide a relatively simpleandsubstantial attachment for use in connection with a pressureregulator which shall have such arrangement and construction of parts aswill cause the regulator `diaphragm and its associated mechanism tovassume a predetermined definite position when acted on by a given boileror other regulated pressure and for other different pressures tosimilarly assume other different but equally definite positions, with aview to providing a highly sensitive and perfectly definite control ofboiler furnaces and the like, of pumps, blowers and other fluid pressureproducing devices.

Another object of my invention is to provide a novel form of' pressurecompensating or regulating device including a movable diaphragm andmechanism associated therewith in such manner that an upward movement ofsaid diaphragm is opposed by an increasing resistance until a point ofequilibrium is reached, `where the 4various parts of the device willcome to rest until a further pressure change occurs,the parts beinglikewise so arranged that a decrease in the pressure under the diaphragmsuch as would cause it to movedownwardly, will'cause a decrease in theforce tending to move it down'until it comes to rest in a state ofequilibrium. f

These objects and other advantageous ends I attain as `hereinafter setforth, reference being had to the accompanying drawings, in which,

The figure is a side elevation of part of a pressure regulator, showingmy invention as applied thereto. v

In the above drawing, 1 represents a cylinder having therein a piston`2to which is.

connected a'y rod 3 attached to a valve, damper or Aother device capableof causing a ychange of pressure in the fluid generated or acted on.Connected to the opposite ends of the cylinder 1 are passages f1 and 5lead-l ing from a valve casing 6 in which is a movable valve element -7controlling the iow of a suitable motiveluid into an out of saidpassages and the ends of the cylinder to whichfthey are connected.

In the present case the cylinder 1 is mounted on a box or casing 8 inwhose. lower portion is a flexible diaphragm 9 forming a chamber 10connected through a conduit 11 with the source of the fluid underpressure to be controlled. The diaphragm 9 carries a plate 12 bearingagainst a main lever 13 fulcrumed within the casing 9 upon a suitablesupporting block 1/1. Said lever extends out through an opening in theside of the casing 8 and through a link 15 is connected to an arm 16pivoted to a fixed support 17 and also connected to the valve element 7.

The outer end of the lever 13 has' pivotally connected to it one arm 18of a T" lever including a second arm 19 extending at right angles andsaid first arm has mount-A ed upon it a weight 23 of a mass suitable tothe pressure acting on the diaphragm- 9. The second arm 19 is attachedthrough an adjustable mechanical connection 20 to some immovablestructure 22, such as the frame of the regulator.

The member 20 preferably consists of a pair of threaded rods adjustablyengaged by a turnbuckle and one' rod is pivotally connected to the fixedstructure 22 while the other may be connected to the arm 19 at any of anumber of points between its free ends andthe arm 18.

Under conditions of "peration, if the pressure of the fluid deliveredthrough the conduit 11 into the chamber 10 should be increased above acertain definite amount, the diaphragm 9 is forcedy upwardly, swingingthe main lever 13 about its fulcrum and rais-` 30 nite position.

sequently any upward movement of the diaphragm 9.1neets with a raplidlyincreasing resistance and is stopped w en the upward and downward forceshave reached an equality. The valvef element 7 is consequently given aperfectly definite position for a predetermined increase of the pressureon the diaphragm 9, so that flow of motive fluid into and out of thecylinder 1 is so regulated as to cause thev piston 2 and rod 3 tolikewise assume a definite position.

uIf it be' assumed that the diaphragm 9 moves downwardly as a result ofthe lessening of the pressure in the chamber 10, the main lever 13 underthe action o the weight 23 will likewise fall, lowering tie fulcrumpoint 21 so that the weight 23 swings i11- wardly from its normalposition, causing a decrease in .the effective length of the main 2.0lever 13.l There is consequently a decrease inthe downward force exertedupon the diaphragm 9`by the Weighted arm 13 and its motionA is stoppedwhen the upward and downward forces have reached an equality.d

The valve element 7 is thus moved to another delinite' position in itscasing 6 corresponding to this reduced pressure in the chamber 10, sothat the piston 2 and rod3 are again caused to move to another deli- Theabove described parts will thus assume definite positions foreachalteration in the luidpressure on the diaphragm 9, thus making itpossible to obtain a sensitivity and definiteness of control offurnaces, pumps and otherv Huid pressure producing mechanisms which haslong been desired in the 1. In combination, a main lever; an auxil- 40iary T-lever positioned below said main lever and having alongitudinally extending f. arm and a cross arm,l one end of the latterbeing pivoted to said; rst lever and the other end supporting a weight;and means for connecting the end of said lfirst-mentioned arm to asupport, whereby a movement of said main lever may cause a movement ofsaid weight.

art.

2. The combination in a pressure regulating device of afluid actuatedmember; a main lever operative on said member; a T- lever, one arm ofwhich is disposed below said first lever and connected thereto;l aweight hung from another arm of said T- lever; and means for causingsaid weight to swing toward or from the ful'crum of the irst lever asthe latter is moved by the fluid actuated member.

3. The combination in a pressure regulating device of a iuid actuatedmember; a.

main'lever operative on said member; a second lever having va pair ofarms, one of which is connected to the first lever; a weight hung fromthe second lever; and means for causlngsaid wei ht vto swing` toward orfrom the fulcrum -of t e first lever as the latter is moved by the fluidactuated member; said means comprising an element connecting the otherof'said arms to a fixed structure, said last-mentioned arm extendingsubstantially parallel to said main lever sand below the same'.

4. The combination in a pressure regulating device-of a fluid actuatedmember; a

main lever operativeon saidmember; a T- lever connected te the firstlever; a weight hung from the second lever; and means for causing saidweight to swing toward or from 'the fulcrum of the first lever as thelatter is moved by the iuid actuated' member, said means consisting ofan element adjustably latter is movedby the iuid actuated member.

- MYRON P. LAUGHLIN.

